Gnc msm 1000mg: supports healthy joint cartilage gnc msm 1000mg capsules are taken daily to joint cartilage health. Msm is also known as methylsulfonylmethane and it has a sulphur that is found in plants, animals and humans. Msm is a dietary source of sulfur, an essential component of collagen. Msm is an important component for cartilage in the joints gluten free supplement. Gnc msm 1000 mg healthy - 90 capsules (90 servings)